2005 Fiscal Year Final Research Report Summary
Development of a duplex system with B-mode and ultrasonic velocity imaging for inspection on introduction of the genes into heat muscle and their effect
| Project/Area Number |
16500320
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Medical systems
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| Research Institution | Tokushima Bunri University |
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Principal Investigator |
KONDO Toshio Tokushima Bunri University, Faculty of engineering, Professor, 工学部, 教授 (50299335)
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| Co-Investigator(Kenkyū-buntansha) |
KOHNO Masakazu Kagawa University, Faculty of Medicine, Professor, 医学部, 教授 (20153489)
SENDA Shoichi Kagawa University, Faculty of Medicine, Professor, 医学部, 教授 (30145049)
OHMORI Koji Kagawa University, Faculty of Medicine, Associate Professor, 医学部, 助教授 (00263913)
YOSHIDA Tomoji Tokushima Bunri University, Faculty of engineering, Instructor, 工学部, 講師 (80220656)
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| Project Period (FY) |
2004 – 2005
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| Keywords | Biology and bio-engineering / Medicine and welfare / Information engineering |
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| Research Abstract |
A B-mod and ultrasonic velocity imaging duplex system in vitro has been developed. This is a research prototype instrument used to investigate acoustic properties in a diseased rat heart. The performance of the instrument is extremely affected by abilities of an array transducer, and then many improvements for the transducer has been carried out. They are followings :
1 It is proposed that unidirectional carbon composite materials allow the realization of the materials under 0.1 Poisson's ratio. And it is explained by computer simulation and experiment results that the use of the composite materials for the matching layers of the transducer decreases sharply the mechanical coupling between the adjacent elements of the array.
2)It is proposed in the report that the use of unidirectional carbon fiber composites allows perfect acoustic impedance matching of the piezoelectric ceramics and the backing. The material used for backing of a transducer is unidirectional carbon fiber-epoxy composite loaded with tungsten powder. The new material is high acoustic impedance with light-weight and perfect acoustic impedance matching between the piezoelectric ceramic and the backing material is available with the new material. Perfect impedance matching between piezoelectric ceramics and baking in a transducer exhibits a good dumping and short pulses.
The newly development of the duplex system requires the ability to do verification. Then, we have studied test phantoms for the instrument. Tissue equivalent materials for the phantom are important for quality control. We have dealt with polyurethan gel and oil gels. The sound velocities of the materials were attained from 1450 to 1550 m/s and the attenuation constant of the materials was adjustable by dispersing suspended powder. The materials are stable in their physical properties during past a few months.
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